TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIt is well known that delivery of projects according to plan and for minimal costs depends on having the right people, processes, and technology in place. The consequences of not adequately implementing these elements for difficult drilling projects can result in total failure to reach objectives and/or substantial overspending of both planned and theoretical minimum cost. This case study will outline the processes used to get the appropriate people and technology in place to deliver a high pressure, high temperature, deepwater wildcat off the north coast of Brazil. The paper will focus on the management of down hole problems, logistics, technology transfer, and high currents for a well drilled at the boundaries of worldwide experience on multiple fronts.
Field Background In Aug. 2015, Umm Lulu drilling team drilled and completed well014 as a first linerless design by setting the 9 5/8" casing in Thamama-I formation and drilling an 8 ½" section till TD, relying on swell packer for zonal isolation. Post evaluation of UL-14 design found cross flow between Thamama-I formation and Thamama-II target reservoir. The drilling division developed another design by extending drilling the 12 ¼" hole till Thamama-I A base to isolate Thamama-I with cement after running the 9 5/8" casing and drilling 8 ½" hole till section TD. This scenario was not possible to execute due to the unavailability of completion equipment (4 ½" × 8 ½" swell packer). The drilling division thought out of the box to drill 6" hole directly from 9 5/8 casing to address the equipment availability constraint. This option was pursued after thorough evaluation of all potential challenges. In April 2017, well018, which was a first revised design, was drilled and completed successfully 10 days ahead of plan, saving $2.00M. In June 2017, well020 was delivered with the best jack up 10k duration in ADMA-OPCO (31.5 days) and the best single oil producer with lower completion duration of 56 days, saving more than 15 days and $3.2M.
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